cisco_ironport_enum module

This module scans for Cisco Ironport SMA, WSA and ESA web login portals, finds AsyncOS version and performs login brute force to identify valid credentials.
Fix author's email format
Fix indent level
Land #2223 - MiniWeb (Build 300) Arbitrary File Upload
Land #2225 - Fix dlink_dir300_exec_telnet
Fix telnet negotiation for the raidsonic case
Beautify
Ensure checksum* methods return a Fixnum

Fixes a bug in reverse_http* stagers where requests for the root URI
(i.e., "/") cause a NoMethodError on nil returned by checksum8.

[See #2216]
Merge pull request #2112 from shuckins-r7/bug/remove-rname-validation

Update to MDM 0.16.6
Land #2226 - Ensure checksum* methods return a Fixnum
new revision - cisco_ironport_enum

Added code to check successful conn first, so now if there is no connectivity on target port, script aborts run.
New check to ensure 'set-cookie' is set by the app as expected, before any further fingerprinting & b-f starts.
If the app is not Ironport, 'set-cookie' will not be set & remains null, and so script aborts run.
De-registered 'TARGETURI.'
Registered 'username' and 'password' with default value.
Changed some run messages.
And lastly, changed the csrf key piece cos I miss a cold beer right now.
Sort import statements alphabetically.
Land #2222, remove Version from module info
Add fail_with() stub and move Failure from Exploit
Remove Failure (moved to parent class)
Switch to Failure vs Exploit::Failure
[Fix RM 8224] - undefined method `include?' for nil:NilClass

Bug due to registry_enumkeys returning nil.
[See RM 8114] - Reduce false positive if traffic is redirected

Fix complaint for hitting this false positive when the user has
all the traffic redirected.
Missed these little devils
Land #2229 - Re-implement fail_with() function